Abstract: A ternary composite phase change material system (DA-LA-SA) was prepared by blending decanoic acid (DA), lauric acid (LA) and stearic acid (SA). Then a series of fatty acid eutectic mixture/expanded graphite composite phase change materials (DA-LA-SA/EG-PCMs) were prepared with DA-LA-SA as phase change component and expanded graphite (EG) as carrier component, by melt blending method. The composition, crystal structure, microstructure, phase transition temperature and enthalpy of DA-LA-SA/EG-PCMs were characterized by FT-IR, XRD, SEM, TGA and DSC. The results showed that when the mass ratio of DA/LA/SA was 1∶8∶1, DA-LA-SA had low phase transition temperature and high phase change enthalpy. EG was composed of numberous pores, and the DA-LA-SA/EG-PCMs with physical combination of EG and DA-LA-SA had good stability through the microporous bound and surface adsorption of EG. When the content of EG was 10wt%, the phase change temperature, enthalpy and thermal conductivity were 38.6 ℃, 123 J/g, and 3.572 1 W·(m·K)-1,respectively, accompanied with a uniform dispersion and small particle size, as well as excellent thermal performance and stability.
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2017, Vol. 31 
